Clinical Studies on Medicinal Mushrooms: What Science Has Actually Examined

Get ready for a journey into a rapidly developing scientific field: clinical research on medicinal mushrooms. Not folk tales and not cure-all promises, but an educational review of what science is actually examining, what is already well established, and what is still in early stages. The mushrooms you know from the forest or the supermarket are also the subject of active biomedical research around the world, and here we sort myth from reality.

Science is beginning to decode what ancient cultures suspected: mushrooms are a rich source of bioactive compounds – β-glucans, triterpenes and more – that are examined in the laboratory and in clinical trials. It is important to remember that throughout this review we are discussing directions of research and traditional uses, not medical recommendations. Anyone who wants an organized overview can start with our complete overview of medicinal mushrooms.

From Ancient Tradition to the 21st-Century Lab: How Medicinal Mushrooms Are Studied

Until a few years ago, the idea of mushrooms as a medical topic sounded marginal. But history repeats itself: ancient cultures – from China to the shamans of the rainforests – used mushrooms for traditional strengthening and healing, and today researchers, physicians and chemists examine those same uses with scientific tools.

The scientific process is orderly: the active components are identified, tested in vitro, and in suitable cases advanced to clinical trials in humans. That is how “grandmother’s medicine” becomes a genuine subject of research – with all the scientific caution that entails. Let’s look at which mushrooms are at the center of the research.

A note on psychoactive fungi: Psychoactive mushroom compounds (such as psilocybin) are studied within separate, strictly controlled clinical-research frameworks. These are controlled substances, they are not dietary supplements, they are not sold by Triterra, and they fall outside the scope of this educational review. This article focuses only on non-psychoactive medicinal mushrooms available as dietary supplements.

1. Lion’s Mane and Cognition: What Is Studied in Relation to the Brain

What does the research on Lion’s Mane show?

Hericium erinaceus, known as the Lion’s Mane mushroom, is researched in the context of cognitive function and neural protection. It does not “make you smart in a day,” but its research directions are interesting.

What does the clinical research say?

• Cognitive function: Several clinical studies (mostly in Japan) have examined daily consumption of Lion’s Mane extract in the context of memory, focus and mental clarity in adults. The observed effect receded when use was discontinued.
• Neural protection and neurogenesis: The active compounds – hericenones and erinacines – are researched in the context of neurogenesis (the growth of nerve cells). This direction has been examined mainly in animal models and in early stages, and not as a treatment for degenerative diseases.
• Mood: Small studies also explore a possible relationship to easing mild anxiety and low-mood symptoms, possibly via an effect on nerve growth factor (NGF).

Lion’s Mane is an example of a non-psychedelic mushroom with a good safety profile that science is only at the beginning of understanding.

2. Reishi: An Ancient Mushroom at the Center of Immunological Research

What is researched about Ganoderma lucidum (Reishi)?

Ganoderma lucidum, or “Reishi,” is called the “mushroom of immortality” in China and is one of the most researched mushrooms, mainly in the context of the immune system.

What do we have in the research?

• Immune-system modulation: Reishi is rich in polysaccharides and triterpenes that are researched in the context of supporting and balancing immune-system function (a structure-function claim). Studies examine Reishi as a dietary supplement in the context of quality of life among individuals – not as a substitute and not as a treatment.
• Stress and sleep: Reishi is considered an adaptogen. Some studies examine it in the context of sleep, fatigue and a general sense of well-being.

Reishi is a classic example of a mushroom that is ancient in its tradition and modern in its research, and still awaiting further substantiation.

Q&A: Reishi – The Facts

Q: Does Reishi cure cancer?
A: No. There is no evidence that Reishi cures cancer, and medicinal-mushroom extracts are dietary supplements only. Some early research examines it only in the context of quality of life. Always consult a physician.

Q: How is Reishi usually consumed?
A: Most often as an extract (in capsules or as a liquid) or as a tea. It is important to choose a quality product with transparent documentation of the concentration of active compounds and with lab testing.

3. Cordyceps: The Mushroom Researched in the Context of Energy and Respiration

What do studies examine about Cordyceps?

Cordyceps sinensis (and sometimes also Cordyceps militaris) is researched mainly in the context of energy, cardiorespiratory endurance and sexual function – which earned it the traditional nickname “Himalayan Viagra.”

What do the clinical studies report?

• Athletic performance: The Cordyceps mushroom is researched in the context of adenosine triphosphate (ATP) production, the energy molecule of the cells. Studies have examined it in the context of endurance, fatigue and maximal oxygen uptake (VO2 Max), and it has become a popular supplement in the fitness world.
• Respiratory context: Traditionally, Cordyceps was used in the context of the respiratory system. Early studies examine it in the context of lung function. This is not an indication for treating asthma, bronchitis or any respiratory disease – those conditions require medical supervision.
• Kidney and sexual function: There is preliminary evidence examining Cordyceps in the context of kidney function and libido, mainly in adults. These are early research directions.

Cordyceps is another example of a mushroom that tradition pointed to, and that science is now examining at the boundaries of what is known about it.

4. Turkey Tail: Research in the Context of Immune Support

What is researched about Trametes versicolor?

Trametes versicolor, known as the Turkey Tail mushroom, is researched mainly in the context of supporting immune-system function.

And what about the studies?

• Research in an oncology context: This is the central research area for Turkey Tail. It is important to distinguish clearly: in Japan, PSK (Polysaccharide-K) and PSP (Polysaccharopeptide) are isolated, standardized compounds approved at the level of prescription medicines – and not the whole-mushroom extract sold as a dietary supplement. These are two entirely different things. Clinical studies in Japan examined these isolated pharmaceutical compounds in the context of the immune response during oncology care, but this does not attribute the same effect – or any therapeutic indication – to the mushroom extract sold as a supplement. Any use alongside oncology treatment requires the approval of the treating physician.
• Antiviral research direction: Laboratory and preliminary studies also examine Trametes in the context of antiviral activity. These are early findings only and not established clinical evidence.

Turkey Tail is an example of the meeting between traditional medicine and modern research. It does not cure any disease and is not a substitute for treatment; it is a subject of research in the context of immune support – a topic that anyone considering it should review with a physician.

Q&A: Turkey Tail

Q: Can Turkey Tail be used alongside oncology treatment?
A: Do not begin using any supplement during oncology treatment without consulting the treating physician, in order to avoid interactions. Keep in mind that the compounds approved in Japan (PSK/PSP) are isolated compounds at the level of a medicine – not the extract sold as a supplement.

Q: Which active components are being studied?
A: The central components are polysaccharides and beta-glucans researched in the context of supporting and balancing immune-system function (a structure-function claim).

5. How Does It Work? The Biochemical Mechanisms Being Studied

What lies behind the active compounds in mushrooms?

We have seen the mushrooms and the research directions. But how does such a simple organism contain compounds that interest science? The answer is in the biochemistry. Mushrooms produce unique compounds that are examined in the laboratory:

• Polysaccharides and beta-glucans: Complex sugar molecules in the cell walls. β-glucans are researched as a central component in the context of the immune system: they bind to receptors on immune-system cells (such as Dectin-1) and are involved in structure-function responses.
• Triterpenes: Compounds with a steroidal structure, researched in an anti-inflammatory context and in the context of the liver. They give Reishi its bitter taste.
• Antioxidants: Many mushrooms, such as Chaga, are rich in antioxidants researched in the context of protecting cells from free radicals.

Why beta-glucan concentration matters – and Triterra’s numbers: One of the biggest differences between a quality extract and a weak supplement is the actual beta-glucan concentration. A quality fruiting body ranges around 25%-40% β-glucan, whereas mycelium-on-grain products usually reach less than 7%. In independent lab testing (TÜV, 07/2025), Triterra extracts measured: Cordyceps 28.16%, Reishi 25.65%, Lion’s Mane 23.93%, and a Turkey Tail + Reishi blend 23.21% (starch: not detected). The full figures can be seen on the transparency page and the lab-testing page.

6. The Challenges Along the Way: Why Research Takes Time

Is it slow regulation or justified scientific caution?

If the potential is so interesting, why isn’t it in every pharmacy? Because the world of medicine is conservative – and rightly so; it must prove safety, efficacy, dosages and standardization. And that takes time and money. The main challenges:

• Standardization: Mushrooms grown under different conditions contain different amounts of active compounds. A fixed standard is hard to achieve with natural materials – which is why transparent lab testing is so important.
• Research funding: Clinical trials are very expensive, and pharmaceutical companies often prefer synthetic compounds that are easier to patent.
• Regulation: Authorities such as the FDA require years of studies across different phases before approving a compound for medical use.
• Stigma: Historical stigma still influences public discussion around some fungi.

The world is changing, technology is advancing, and more researchers understand the potential. But the scientific process requires patience – and that is exactly what separates established science from marketing promises.

Looking Ahead: Where the Mycological Revolution Is Heading

Our review makes one thing clear: clinical research on medicinal mushrooms is at the beginning of a fascinating period, in which nature and science join hands. The potential is enormous – but precisely for that reason it is important to read every finding in its context: what is established, what is preliminary, and what is still preclinical.

If you have made it this far and want to understand which mushroom is relevant to your areas of interest – with no promises and no pressure – explore our complete overview of medicinal mushrooms, browse the glossary of key terms, or find answers on the FAQ page. And anyone who wants to see the data behind the products is welcome to visit the transparency page and the lab-testing page.